Answer:
Hey there, when you are exercising, your muscles need extra oxygen—some three times as much as resting muscles. This need means that your heart starts pumping faster, which makes for a quicker pulse. Meanwhile, your lungs are also taking in more air, hence the harder breathing.
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According to the attached image, the primary source was created Just after Austria-Hungary declared war on Servia (Serbia)
<h3>What is A primary Source?</h3>
In history, a primary source refers to the first account of an event which is narrated by people who were present when such an event occurred.
The primary source of an event is the most direct evidence of a time an event happened and is usually devoid of twists because such events are narrated as truthful as possible.
Learn more about a primary source at brainly.com/question/896456
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Explanation:
Smith states, explicitly and repeatedly, that the true measure of a nation's wealth is not the size of its king's treasury or the holdings of an affluent few but rather the wages of “the laboring poor.”
